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Re: st: R: Anova repeated measures


From   Peter Kraglund Jacobsen <peter@kraglundjacobsen.dk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: R: Anova repeated measures
Date   Thu, 22 Apr 2010 16:42:12 +0200

How do I take take the time factor into account, if not using ANOVA
repeated measures?
How about this:
anova vas gruppe /projektnum|gruppe t t#gruppe , repeated(t)

2010/4/22 Carlo Lazzaro <carlo.lazzaro@tiscalinet.it>:
> Instead of a repeated ANOVA, and warning about the missing values (which may
> raise substantial issues in his analysis), Peter may want to perform an OLS
> on vas as dependent variable with clustered standard error on projektnum,
> being this one the principal sample unit.
>
> ----------------- begin code ------------------
> g gruppe_bis=0 if   gruppe=="Parenteral morphine"
> replace gruppe_bis=1 if gruppe=="XXX with NaCl"
> replace gruppe_bis=2 if   gruppe=="XXX with Naropine"
> reg vas gruppe_bis, cluster(projektnum)
> ----------------- end code ------------------
>
> HTH and Kind Regards,
> Carlo
> -----Messaggio originale-----
> Da: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Peter Kraglund
> Jacobsen
> Inviato: mercoledì 21 aprile 2010 22.24
> A: statalist@hsphsun2.harvard.edu
> Oggetto: st: Anova repeated measures
>
> projektnum      t       gruppe  vas
> 93      1       Parenteral morphine     8
> 93      2       Parenteral morphine     .
> 93      3       Parenteral morphine     9
> 93      4       Parenteral morphine     9
> 93      5       Parenteral morphine     8
> 95      1       XXX with NaCl   5
> 95      2       XXX with NaCl   .
> 95      3       XXX with NaCl   3
> 95      4       XXX with NaCl   2
> 95      5       XXX with NaCl   .
> 101     1       XXX with Naropine       3
> 101     2       XXX with Naropine       .
> 101     3       XXX with Naropine       5
> 101     4       XXX with Naropine       5
> 101     5       XXX with Naropine       .
>
> In this example, three persons (projektnum) in three groups (gruppe)
> are asked about pain score (vas) at five different times (t).
> How do I show if there is a difference in VAS between the three groups?
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